Programming Forums > Script Programming > Python

titaniumdecoy · Dec 18th, 2007, 6:14 PM

There was recently a fairly detailed discussion about text-based game design in Python in this forum.

Chuckiferd · Dec 18th, 2007, 6:21 PM

Quote:

Originally Posted by Sane

It will get messy really quick. But I think you'll learn something. You will need to do some really basic stuff to get comfortable with Python.

Wow. that helped... alot. I suddenly think I am really getting it. I was reading your example and it just hit me. So I get how to pretty much run any text based adventure now. Thank you. The two thing I don't get is the tripple quotes and the 'elif' command. I thought it was just 'if' then the rest were 'else'

ok now let me run this again.

(Toggle Plain Text)

print 'you are at the beginning of a yellow brick road: you see one exit, east'

choice = input ("""enter a command""")

print

if choice == east:

    print 'you are in the middle of the yellow brick road: you see two exits, east and west'

    choice = input ("""enter a command""")
    
    print

    if choice == east:
         print 'you are at the end of the yellow brick road, you loose your balance and fall off the face of the earth'  
    elif choice == west:
         print 'you try going back and are killed by the wicked witch of the west'

print 'Thank you for playing my first game'

Sane · Dec 18th, 2007, 6:42 PM

Quote:

Originally Posted by Chuckiferd

Wow. that helped... alot. I suddenly think I am really getting it. I was reading your example and it just hit me. So I get how to pretty much run any text based adventure now. Thank you. The only thing I don't get is the 'elif' command. I thought it was just 'if' then the rest were 'else'

I'm glad. You're welcome.

Good question. The only difference between an 'if' command and an 'elif' command, is the 'elif' expression can not be satisifed if the 'if' expression was already satisfied.

Here's an example:

(Toggle Plain Text)

if 1 == 1:
    print "We are at the first block"
elif 1 == 1:
    print "We are at the second block"

This will output:

Quote:

We are at the first block

But why? 1==1 for the "elif" block, so why can't we see the second print statement?

The answer is because the first "if" block already executed. Any "elif" or "else" that proceeds the executed "if" will not be executed.

Further demonstrating this fact:

(Toggle Plain Text)

if 1 == 1:
    print "We are at the 0th block"
if 1 == 1:
    print "We are at the 1st block"

if 9 == 0:
    print "We are at the 2nd block"
elif 1 == 1:
    print "We are at the 3rd block"
elif 1 == 1:
    print "We are at block 3 and a half"
else:
    print "We are at the 4th block"

if 9 == 0:
    print "We are at the 5th block"
elif 9 == 0:
    print "We are at the 6th block"
else:
    print "We are at the 7th block"

This will output:

Quote:

We are at the 0th block
We are at the 1st block
We are at the 3rd block
We are at the 7th block

Do you understand why that's the output that occurs?

Sane · Dec 18th, 2007, 6:47 PM

Your code's very close to working. There's just a couple small problems:

If you want the user to enter text, as opposed to a number, you use "raw_input".

raw_input("Enter Command: ") is for text.
input("Enter Number: ") is for numbers.

Then to compare a variable to text, the text has to be wrapped in quotation marks. This is because otherwise it thinks you are trying to refer to a variable name.

Variable names do not use quotes. Numbers do not use quotes. Text does use quotes.

if choice == "east" compares the variable choice to the text east.
if choice == east compares the variable choice to the variable east.
if choice == "1" compares the variable choice to the text 1.
if choice == 1 compares the variable choice to the number 1.

So that gives you now:

(Toggle Plain Text)

print 'you are at the beginning of a yellow brick road: you see one exit, east'

choice = raw_input ("""enter a command""")

print

if choice == "east":

    print 'you are in the middle of the yellow brick road: you see two exits, east and west'

    choice = raw_input ("""enter a command""")
    
    print

    if choice == "east":
         print 'you are at the end of the yellow brick road, you loose your balance and fall off the face of the earth'  
    elif choice == "west":
         print 'you try going back and are killed by the wicked witch of the west'

print 'Thank you for playing my first game'

Chuckiferd · Dec 18th, 2007, 7:37 PM

I meant the tripple quotes in

Quote:

Originally Posted by in my first game it is written

("""enter a command""")

anyways (chuckferd rubs his hands together) it is time for me to seek how to write a combat system. Once I can write something like that I can probally write anything, right? Thank you again for helping me out

titaniumdecoy · Dec 18th, 2007, 7:55 PM

Triple quotes can contain strings that span multiple lines. Although I am not sure why Sane is using them for strings that do not do so.

Sane · Dec 18th, 2007, 9:13 PM

@Chuck:

Well you'll soon find out that you need to learn a bit more. When you run into trouble, do some reading up on "Functions" in Python. They can be used to create subroutines, which will be necessary for making anything larger or more complicated.

@titaniumdecoy:

I used them because he used them.

Read my post that used triple quotes on a multiline string. Then his post that used it on a single line string. Then mine that copy pasted his.

Namingishard · Dec 19th, 2007, 1:09 PM

As for the Pong game try http://freshmeat.net/projects/tompong/ simple pong game should help you out.

P.S sorry if this was already posted I admit I didn't read all four pages of post.

Dec 18th, 2007, 6:14 PM	#31
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 836 Rep Power: 3	Re: I'm a Beginner There was recently a fairly detailed discussion about text-based game design in Python in this forum.

Dec 18th, 2007, 6:47 PM	#34
Sane Programming Guru Join Date: Apr 2005 Posts: 1,784 Rep Power: 5	Re: I'm a Beginner Your code's very close to working. There's just a couple small problems: If you want the user to enter text, as opposed to a number, you use "raw_input". `raw_input("Enter Command: ")` is for text. `input("Enter Number: ")` is for numbers. Then to compare a variable to text, the text has to be wrapped in quotation marks. This is because otherwise it thinks you are trying to refer to a variable name. Variable names do not use quotes. Numbers do not use quotes. Text does use quotes. `if choice == "east"` compares the variable choice to the text east. `if choice == east` compares the variable choice to the variable east. `if choice == "1"` compares the variable choice to the text 1. `if choice == 1` compares the variable choice to the number 1. So that gives you now: (Toggle Plain Text) print 'you are at the beginning of a yellow brick road: you see one exit, east' choice = raw_input ("""enter a command""") print if choice == "east": print 'you are in the middle of the yellow brick road: you see two exits, east and west' choice = raw_input ("""enter a command""") print if choice == "east": print 'you are at the end of the yellow brick road, you loose your balance and fall off the face of the earth' elif choice == "west": print 'you try going back and are killed by the wicked witch of the west' print 'Thank you for playing my first game' print 'you are at the beginning of a yellow brick road: you see one exit, east' choice = raw_input ("""enter a command""") print if choice == "east": print 'you are in the middle of the yellow brick road: you see two exits, east and west' choice = raw_input ("""enter a command""") print if choice == "east": print 'you are at the end of the yellow brick road, you loose your balance and fall off the face of the earth' elif choice == "west": print 'you try going back and are killed by the wicked witch of the west' print 'Thank you for playing my first game'

Dec 18th, 2007, 7:55 PM	#36
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 836 Rep Power: 3	Re: I'm a Beginner Triple quotes can contain strings that span multiple lines. Although I am not sure why Sane is using them for strings that do not do so.

Dec 18th, 2007, 9:13 PM	#37
Sane Programming Guru Join Date: Apr 2005 Posts: 1,784 Rep Power: 5	Re: I'm a Beginner @Chuck: Well you'll soon find out that you need to learn a bit more. When you run into trouble, do some reading up on "Functions" in Python. They can be used to create subroutines, which will be necessary for making anything larger or more complicated. @titaniumdecoy: I used them because he used them. Read my post that used triple quotes on a multiline string. Then his post that used it on a single line string. Then mine that copy pasted his.

Dec 19th, 2007, 1:09 PM	#38
Namingishard Newbie Join Date: Feb 2006 Location: TX Posts: 23 Rep Power: 0	Re: I'm a Beginner As for the Pong game try http://freshmeat.net/projects/tompong/ simple pong game should help you out. P.S sorry if this was already posted I admit I didn't read all four pages of post.

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Programming Forums > Script Programming > Python

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